#whiteboard_cover {
 position: absolute;
 filter:alpha(opacity=60) !important;
 -moz-opacity:0.6 !important;
 -khtml-opacity: 0.6 !important;
 opacity: 0.6 !important;
  top:-100px;
  left:0px;
  background:#666;
  z-index:5;
  width:100%;
  height:150%;
}

#whiteboard_table {
  position:absolute;
  z-index:10;
  top:0px;
  left:0px;
  width:100%;
  height:100%;
}

.hidden_element {
  width:1px !important;
  height:1px !important;
  border-width:0px !important;
}